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Platinum Plus is their old Visa from before all the BankAmericard Cash/Travel Rewards cards came out.
It's basically a no-frills no-rewards Platinum Visa. Sounds like they have now repurposed it as an unadvertised builder card.
platinum plus is still part of the base generic name at BOA. I have a cash rewards, it still has platinum plus as part of the card name in online banking.